Pitman box for use on mowers and binders



Nov. 24, 1925. 1,562,797

H. w. SHULL PITMAN BOX FOR USE ON MOWERS AND BINDERS Filed Feb. 16, 1923 Patented Nov. 24, 1925,

UNITED ETATELS PATENT OFFICE.

HARRY W. SKULL, OF BROADWATER. NEBRASKA. ASSIGNOR DF ONE-HALF TO JAMES E. MURPHY, 0F ALLIANCE, NEBRASKA.

PITMAN BOX FOR USE ON MOWERS AND BZNIDERS.

App1ication filed February 16, 1923. Serial No. 619,482.

To all 107mm it may concern:

Be it known that I, HARRY XV. SKULL, a citizen of the United States, residing at Broadwater, in the county of Merrill and State of Nebraska, have invented a new and useful Pitman Box for Use on Mowers and Binders, of which the following is a specification.

My invention relates to improvements in pitman boxes. The objects of my improvements are, first, to eliminate play and vibration, and provide a constantly tight box ing, second to extend the period of usefulness of the bushing, third, to extend the period of usefulness of the wrist pin, fourth, to obtain a more perfect lubrication, and fifth, by reducing the play and vibration of the wrist pin in the boxing, to save the sickle blade and other parts of the mower or binder from wear and breakage thus extending the period of usefulness of the machinery, as well as providing a means of quickly repairing or replacing the worn or broken parts.

I attain these objects by the mechanism i1- lustrated in the accompanying drawing, in which Figure 1, is an ordinary type of pitman box made of one solid piece with one piece bushing and side lubrication of the char-- actor in present use; Fig. 2, shows the improved pitman box; Fig. 3, is the two sections ofthc pitman box separated; Fig. 4, shows the bushing in two sections; Fig. 5, is the wedge 0r shim.

Similar numerals refer to similar parts throughout the several views.

The pitman box is made in two sections, (Figs. 2 and 8,) 1, 2 held together on the front side by two bolts 3 extending through holes 13 and 14, and at the back side by the pitman straps 4i and bolt 15 which clamp onto the boxing at 11. The bushing 5 fits into the lower section of boxing and is held firmly in place by a raised place on the under surface which fits into groove at 6, the up per section of bushing 7 being held in place by a depression 8 in the center on the top side which serves as an opening for lubrication at 9 which is furnished from the hard oil cup 10. The wedge or shim 12 is slipped between parts 1 and 2S0 that said parts will fit accurately upon the wrist pin. As the bushing 5 and 7 becomes worn the width of the shims 12 is reduced so the boxing can be drawn closer together on the wrist pin and vibration minimized. Oil from the hard oil cup 10 enters the boxing 1 at 9 so the lubrication is equally distributed about the wrist pin.

1 claim:

1. A pitman box for mowers, binders and the like wherein the pitman is formed of an arm adapted for axial and rocking 1nov ment, operated from a rotating crank having a crank pin, comprising separable bearing sections formed with substantially semi-cylindrical crank pin receiving p0rtions, and laterally extending flanges from the ends of the semi-cylindrical portions, semi-cylindrical bushings removably fitted in the corresponding portions of said bearing sections for providing a bearing on the crank pin, means for holding the bushings against movement in the bearing sections, removable shims between the flanges of the sections, and means cooperating with the flanges of each section for securing the sections in bearing forming relation, said shims permitting the adjustment to take up wear, and straps secured to the flanges at one end of each section by the securing means therefor. and to the sides of the pitman for mounting the bearing on the end of the pitman, the bearing sections being adjustable transversely with relation to the axis of said pitman.

2. A pitman box for mowers, binders and the like, wherein the pitman is formed of an arm adapted for axial and rocking movement, and adapted for operation from the rotating frame having a laterally extending crank case comprising separable semi-cylindrical bearing sections having flanges ex tending in opposite direction from the oppo site ends thereof, bushing removably mounted in the bearing portion of each section, means connected with corresponding flanges of each bearing section for securing said sections in bearing forming relation, remov able shims positioned between the flanges of said sections for adjusting the relation thereof, a pair of strips mounted on the from said crank arm to provide a bearing side of the pitinan and projecting beyond for the pitinan rod, said bearing section bethe end thereof, said bearing having the ing adjustable laterally to the axis of said 10 flanges at one end of each section projectpitman, for compensating for Wear in the 5 ing between said strips and secured thereby bearing 011 the Crank P by said securing means, said bearing being adapted to receive the crank pin extending HARRY V. SI-IULL. 

